Long-term Spectral and Timing Behavior of XTE J1908+094

Physics

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Actively Accreting And Transient Binaries

Scientific paper

The X-ray transient XTE J1908+094 was serendipitously discovered during RXTE ToO observations of SGR 1900+14 in February 2002. Following the discovery, RXTE routinely monitored the region. At the onset, the source was found in a spectrally hard/low state lasting for ~40 days, followed by a quick transition to the soft/high state. At the highest X-ray intensity level (seen on April 6), the source flux (2-10 keV) reached ~105 mCrab, then decayed rapidly. Overall outburst characteristics resemble the transient behavior of galactic black hole candidates. Here, we present the long term light curves, and detailed spectral and timing investigations of XTE J1908+094 using RXTE PCA data. We also report the results of Chandra ACIS-S and BeppoSAX MECS observations which were performed during the decay phase.

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